﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace RoutingDemo
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            Route blogArchiveRoute = new Route(
                "archive/{year}/{month}/{day}",
                new MvcRouteHandler()
                );

            blogArchiveRoute.Defaults = new RouteValueDictionary(
                                            new
                                            {
                                                year = 2008,
                                                month = 0,
                                                day = 0,
                                                controller = "Home",
                                                action = "Index"
                                            });

            //blogArchiveRoute.Defaults = new RouteValueDictionary
            //                                {
            //                                    {"year",2008},
            //                                    {"month",0},
            //                                    {"day", 0}
            //                                };

            blogArchiveRoute.Constraints = new RouteValueDictionary(
                                            new
                                            {
                                                year = @"\d{2}|\d{4}",
                                                month = @"\d{1,2}",
                                                day = @"\d{1,2}",
                                                date = new DateIsValidConstraint()
                                            });

            routes.Add(blogArchiveRoute);

            routes.MapRoute(
                        "Default",                                              // Route name
                        "{controller}/{action}/{id}",                           // URL with parameters
                        new { controller = "Home", action = "Index", id = "" }  // Parameter defaults
                    );

        }

        protected void Application_Start()
        {
            RegisterRoutes(RouteTable.Routes);
        }
    }

    public class DateIsValidConstraint : IRouteConstraint
    {
        public bool Match(HttpContextBase httpContext, Route route, string parameterName, RouteValueDictionary values, RouteDirection routeDirection)
        {
            try
            {
                DateTime date = new DateTime(
                    Convert.ToInt32(values["year"]),
                    Convert.ToInt32(values["month"]),
                    Convert.ToInt32(values["day"])
                    );
                return true;
            }
            catch
            {
                return false;
            }
        }
    }
}